Total carbon: Every 2-3 years Method of measuring total carbon: After: Springer & Klee (1954). Total nitrogen: Every 2-3 years. Method of measuring total nitrogen: See Hoffmann,G (ed) (1991). Soil bulk density or weight: Occasionally Method of measuring soil bulk density or weight: An open cylinder is pressed into the undisturbed soil. Other nutrients: P2O5,K2O,MgO. See Hoffmann, G (ed) (1991).

d) Details of the meteorological station

Nearest meteorological station to the site: BASF AG Limburgerhof which is .3 km from the site at coordinates 8deg24min E, 49deg25min N. The meteorological station is manual.

Width of smallest plot is 10 m Length of smallest plot is 4.2 m Slope: 0 Details of direction of cultivation: Parallel Width of Discard Strip around plot: Varies with crop. Details of homogeneity of the plots: More or less homogeneous.

b) Details of replication, randomization and controls

There are at least 3 replicates in the experiment. There are control plots described as follows: Nil plots